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Vaudreuil IESG X.6.2 Conversion required and prohibited Not given The content of the message must be converted before it can be delivered and such conversion is not permitted. A typical error message for this situation would be: “421 Too many concurrent SMTP connections from this IP address; please try again later”. If all the recipient email addresses check out as regards the domain part of the email addresses, then one of the servers on the way to the recipient(s) has DNS problems If the error persists, check all your recipients' addresses and if you've been blacklisted. 541 The recipient address rejected your message: normally, it's an error caused by an anti-spam filter.

Because the number space is large, it is not intended that published status codes will ever be redefined or eliminated. Home Partner Status Sitemap Contact us Legal Prolateral Consulting Ltd Bramingham Business Centre, Enterprise Way, Luton, Bedfordshire, LU3 4BU VAT No. Either your email has been blocked by the recipient's firewall, or there's a hardware problem. Connection Manager Automatic & Manual Blocks: 451 not currently accepting mail from your ip - psmtp 518 Sender not authorized from this ip - psmtp 550 mailbox unavailable - psmtp 550

Note: A "500 unrecognized command" server response is often a case of antivirus software and/or firewall interfering with incoming and/or outgoing SMTP communications. You get this NDR when you make a typing mistake when you manually try to send email via telnet. Status Code 5.X.X - Errors 5.0.0 Syntax error command not recognized. Encryption required for requested authentication mechanism. 458 Unable to queue messages for node node. 459 Node node not allowed: reason. 500 Command not recognized: command.

Check the Routing Group Connector. This can result in a 4.x.x code being sent back. SMTP address should be NOT 5.5.0 Requested action not taken: mailbox unavailable. Of course not!

SMTP codes that the message security service passes between MTAsdo notinclude the - psmtp suffix. Check SMTP Virtual Server Access Tab. For example: “SMTP Error 450 5.2.3 Msg Size greater than allowed by Remote Host”. Our server tried ehlo, the recipient's server did not understand and returned a 550 or 500 error.

User not local, will forward to forwardpath. 252 OK, pending messages for node node started. Look outside Exchange for a connectivity problem. 5.3.3 Remote server has insufficient disk space to hold email. The server doesn't reject the message with a 5. This is a special case of X.7.21. (This violates the advice of Section 6.1 of [RFC6376].) [RFC7372] (Standards Track); [RFC6376] (Standards Track) M.

RFC 2554 BDAT Binary data. A 4.x.x code indicates a temporary error. More... SMTP Status 221 is often misconstrued as an error condition, when it is in fact nothing of the sort.

This code should be used as a persistent transient failure. [RFC3463] (Standards Track) G. This limit may either be for physical or administrative reasons. You might not need to try all of them to get the message sent successfully. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server”. 5.0.4 Command parameter not implemented.

Possibly the user was moved to another server in Active Directory. The server (yours or the recipient's) is not available at the moment, so the dispatch will be tried again later. 422 The recipient's mailbox has exceeded its storage limit. If you are not a spammer, please try later.”. Or "Requested action not taken: mailbox name not allowed" if you are executing an SMTP. 5.5.4 Transaction failed. 5.5.5 Wrong protocol version. 5.6.3 More than 250 attachments. 5.7.1 Permissions problem.

Like error 432, it's related only to Microsoft Exchange. Address field maybe empty. The message originator needs to decide whether to reissue the message without RRVS protection. [RFC7293] (Standards Track) M. It also contains some notes and recommendations regarding Microsoft Exchange Server. 2.0.0 (nonstandard success response, see rfc876). 2.1.1 System status, or system help reply. 2.1.4 Help message. 2.2.0 Service ready. 2.2.1

This is useful only as a permanent error. [RFC3463] (Standards Track) G. This error code occurs after a successful authentication to a disabled account. For example, check correct SMTP format. The syntax of the new status codes is defined as: status-code = class "." subject "." detail class = "2"/"4"/"5" subject = 1*3digit detail = 1*3digit White-space characters and comments are

Try a plain message with encryption. 5.7.6 Certificate problem, encryption level maybe to high. 5.7.7 Message integrity problem. This memo does not discuss the merits of any such filtering, but provides a mechanism to report such. For other information check out our article on what is an SMTP server.252The server cannot verify the user, but it will try to deliver the message anyway.The recipient's email account is These errors can generally be corrected by the sender and retried. [RFC3463] (Standards track) G.

Servers should send only defined, registered status codes. Check delivery server settings 5.7.5 Cryptographic failure. Klensin IESG X.3.3 System not capable of selected features Not given Selected features specified for the message are not supported by the destination system. This may also be a permanent error if the sender has indicated that conversion with loss is prohibited for the message. [RFC3463] (Standards Track) G.